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The Labor Department said Friday that unemployment rates fell in only two states and were unchanged in four.

Unemployment rates rose in nine states that are considered battlegrounds in the presidential election. That trend, if it continued, could pose a threat to President Barack Obama's re-election bid in less than three months.

Nationwide, hiring improved in July after three months of tepid job gains. But the national unemployment rate ticked up to 8.3 percent from 8.2 percent. Monthly job gains have averaged 150,000 this year. That's barely enough to accommodate population growth. As a result, the unemployment rate is the same as when the year began.

Still, 31 states gained jobs in July, while 19 lost them. Unemployment rates can rise in a state even when more jobs are created if more people start looking for work. People who are out of work are counted as unemployed only if they're looking for a job.

In the most closely contested states in the presidential race, unemployment has fallen over the past year. That could help Obama in his contest with GOP candidate Mitt Romney.

But it has started to tick up in recent months. In Nevada, the rate rose to 12 percent in July from 11.6 percent the previous month. That's the highest rate in the nation, though it's still much lower than a year ago, when it was 13.8 percent.

And in Michigan, the rate has increased to 9 percent, from 8.5 percent two months earlier.

Unemployment also increased in Florida, Virginia, North Carolina, Iowa, Pennsylvania, Michigan, Colorado, Wisconsin and New Hampshire.

The rate was unchanged at 7.2 percent in Ohio, the only swing state that didn't suffer an increase. Still, that rate is down sharply from 8.9 percent a year ago.

Most competitive states have unemployment rates below the national level, so even recent increases may not have a large impact on voter sentiment.

Iowa's unemployment rate, for example, increased to 5.3 percent, still the sixth-lowest in the country. New Hampshire's rose to 5.4 percent and Virginia's increased to 5.9 percent, both far below the national rate.

Only four swing states have higher unemployment rates than the national figure: Nevada, Michigan, North Carolina at 9.6 percent, and Florida at 8.8 percent.

Some battleground states reported large job gains that could lead to lower unemployment rates in coming months. Michigan added 21,800 jobs, the second-largest increase in the nation, after California. Michigan's gains were mostly in manufacturing and government. Virginia reported the third-largest increase, 21,300, mainly in education and health care.

Most other battleground states added small numbers of jobs.

Unemployment rates and total jobs data are derived from two separate surveys and aren't always consistent each month. But they tend to even out over time.

Many political scientists say voter attitudes may be shaped more by national economic trends than local or statewide changes.

Most Americans probably read or hear more news about the national economy than they do about their local areas, some experts say. And they may not attribute regional economic changes to presidential policies.

Overall, the economy hasn't been growing fast enough to generate more hiring. It expanded at an annual rate of only 1.5 percent in the April-June quarter, down from 2 percent in the first quarter and 4.1 percent in the final three months of last year.